gleaning ideas on a build up from a 3.0 or a 3.2

[pete-stevers]

i would like to build a 3.2 or bigger but would like to use a factory injection sys.
will the stock 3.0 injection be usable if the motor is built to a 3.2 or 3.4
or will or should i be looking for a complete 3.2 to build up to a 3.4...and will the motronic injection be ample to supply fuel to a steetable 3.4
i have aircare to deal with, so agro cams and carbs may not be the answer...they only check immisions, not origanality of the motor or exhaust( i am currently building a dual cat muffler for this purpose)

[Carrera3.5L]

Originally posted by pete-stevers
i would like to build a 3.2 or bigger but would like to use a factory injection sys.
will the stock 3.0 injection be usable if the motor is built to a 3.2 or 3.4
or will or should i be looking for a complete 3.2 to build up to a 3.4...and will the motronic injection be ample to supply fuel to a steetable 3.4
i have aircare to deal with, so agro cams and carbs may not be the answer...they only check immisions, not origanality of the motor or exhaust( i am currently building a dual cat muffler for this purpose)

You can retain the CIS or Motronic when increasing displacement, whether for budget, originality or emissions reasons. There are plenty of motors up to 3.7L built from 3.0L or 3.2L starting points.

A search should yield a myriad of options regarding displacement increases (i.e. bore, stroke or bore & stroke) for these motors.

Providing your your budget for the engine build, what core engine you are starting with, and whether you are building the motor yourself or paying someone can determine the best course of action and the projected results.

Ralph

[pete-stevers]

i will need to find a builder( locally - pacific northwest) for the motor, i have not bought a core yet.... but am leaning twards the 3.2 core w injection and goodies attached....

[pete-stevers]

will the 3.2 injection be able to keep up to 3.4 or bigger??
or will the injection be the limiting factor in the motors performance??

[Carrera3.5L]

If you are starting without a core motor, you may consider being patient in your search and look for a used 964/993 3.6L and than rebuild that with mild performance in mind to satisfy emissions constraints. These motors will easily make 275-285 horsepower without sacrificing longevity and remain emissions friendly.

3.2L and 964 3.6L motors are not all that different in price these days if you can pounce on a deal. For the cost of purchasing a 3.0L or 3.2L core and spending the necessary money on go-fast bits and than paying someone to assemble it all you can buy a 3.6L, rebuild it and have it transplanted in the car.

I would only consider a 3.4L/3.5L if you already had a 3.2L to start with...

The Motronic can handle the larger 3.4L/3.5L (all the way to 3.7L) motors with little difficulty...

Lower compression ratios due to pump gasolines and camshaft selection due to emissions concerns will be your most prevalent limiting factors in motor performance...

Ralph

[Steve W]

The 3.2 injection can handle the fuel requirements of a 3.4, 3.5, and even a 3.7 without modification. Only a properly programmed chip is necessary to provide the necessary amount of fuel required. Between a SC or 3.2 motor as a base, the 3.2 is a much more refined and superior injection and intake system. The intake runners are larger and increasing displacement on a 3.0 would end up choking off the top end with the existing CIS/intake setup.

A 3.6 motor does make a great power plant in a lightweight early body. With the lower gear ratios of the pre 89s, the torque and throttle response is fantastic. My choice of a 3.6 motor would be from a 95 993.

[JeremyD]

Originally posted by pete-stevers
will the 3.2 injection be able to keep up to 3.4 or bigger??
or will the injection be the limiting factor in the motors performance??

I think your checkbook will be the limiting factor

[Jeff Alton]

What Ralph and Jeremy said.......

If you want to see a 3.4 with all the goodies (itb's, cams, twin plug, stand alone efi, blah blah blah) I can show you mine. Oh, and I can show you the parts bill as well!!! Luckily I did the labour or that may have added another 4000 plus to the motor......

The only thing with a 3.6 is you are buying a used motor of which you can't really be sure of the history. That said, many people have used 3.6 motors in their cars and have had no problems...

Cheers